Siraj, M. M.; Anwar, A. A.; Hashan, M. N.; Rana, M.; Parvin, T.; Mohammed, N.; Ansari, S.; Rahman, M. W.; Mandal, M. R. M.; Ahmed, C. M. Evaluation of Subclinical Systolic Dysfunction in Patients With Heart Failure With Preserved Ejection Fraction, Using 2D Speckle Tracking Echocardiography. Univ. Heart J. 2025, 20, 3-9.